Boats searched for the unidentified teenager throughout the night, the spokeswoman said. At first light on Sunday, the Coast Guard resumed their helicopter search.

A dive team from the New Orleans Police Department also resumed their efforts Sunday morning.

Witnesses told the Coast Guard that the boy was swimming much of the day with family and friends. After he dove from a pier at the old Pontchartrain Beach around 3:30 p.m., he did not resurface, the witnesses said.